Composing an original soundtrack is far different than writing an album of original songs. Now that that is out of the way, culling and piecing together tunes is as much of art as it is a science. It also explains why Belle & Sebastian frontman Stuart Murdoch was willing to go way back into his personal catalog to unearth gems that predated the Scottish band’s existence.

In this case, that means the 1993 deep cut “Safety Valve,” a song that Murdoch re-recorded specifically for the “Days of the Bagnold Summer” soundtrack. It’s a song he stumbled upon while culling through a batch of old material and reading the comic novel that inspired the film.

“It’s ancient! It’s probably the oldest song I’ve ever recorded with Belle & Sebastian,” Murdoch said. “It predates the group by a couple of years, but I was just going through this period of

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